from Atomicawe
A photons is a tiny particle that comprises wave of electromagnetic radiation. Photons doesn’t have a charge no mass and photons are travel at the speed of light. Even though Photons have no mass, they have momentum.
Photons are often described as “Energy Packets”. A photons , also called light quantum, is a minute energy packet of Electromagnetic Radiation. The energy of the photons of all energies from high- energy gamma rays and x- rays, through visible light, to low- energy infrared and radio waves.
Now, let’s delve into the concept of stopping potential. When electrons are ejected from the metal surface due to the photoelectric effect, they possess kinetic energy. If we apply an external voltage (a potential difference) between the metal surface and a collector electrode, we can control the movement of these ejected electrons.
As we increase this potential difference, eventually, we reach a point where all emitted electrons are halted in their tracks — they can no longer reach the collector electrode. This voltage at which the flow of electrons ceases is called the stopping potential.
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